Obviously, seeing objects is
possible thanks to our eyes.
The human eye is a light receiver that converts this one in nervous
signals sent to brain through of the optic nerve.The brain interprets
these signals and reconstructs an image.
"light receiver" indicates that eye must receive the light emitted by
an object so that it can be seen.
light is possible under some conditions:
- The eye must be oriented so that the light emitted by the object can
penetrate its pupil.
- The object must emit enough light so that it can be detected by the
- The area, between eye and observed object, must let pass light. This
kind of medium is said " transparent " (as opposed to opaque which
qualify a medium that doesn't allow propagation of light)